Three generalized variational principles ( among which two are for homoentropic flow, and the other for non homoentropic flow) are developed first, and then from them three families of variational principles are derived respectively by means of successive transformations. 结果有:1.对均熵流动,建立了两条广义变分原理,并从它们派生出两族亚广义变分原理,包括亚声速下的一对互偶极值原理;
The numerical method is composed of the characteristic in the modified homoentropic method for one-dimension non-steady flow, the trapezium integration and Hartree iterative scheme. 使用一维非定常匀熵修正理论的特征线性,利用梯形积分法和Hartree迭代法给出了数值计算方法。